Influence of plant cell wall composition and degradation on the feed intake, nutrient digestibility, and milk production of buffaloes at mid-lactation
2003
Florendo, P.D.C. | Roxas, D.B. | Robles, A.Y. | Aquino, D.L. | Abella, M.P. | Encarnacion, J.M. (Philippine Carabao Center, Munoz, Nueva Ecija (Philippines))
The major feed resource for ruminants consists of fibrous feed materials. Thus, the authors studied the use of cell wall composition and in sacco cell wall degradability in the preparation of feed supplementation to rice straw-based diets and related nutrient intake and digestibility. Animals used were milking buffaloes in their mid-lactation. The fibrous feed materials used were ricestraw (RS), brewers spent grains (BSG), and copra meal (CM). Findings showed that the RS intakes of buffaloes supplemented with wet BSG, CM, and the mixture of wet BSG and CM were comparable. Supplementation of either BSG or CM resulted in significant improvement in the buffaloes feed intake TDMI of lactating buffaloes fed RS and feed supplements of 50:50 BSG and CM was the highest (12.69 kg), followed by those supplemented with BSG (11.0 kg) and CM (10.0 kg). TDMI as percent of body weight (BW) was highest (2.45%) in buffaloes supplemented with 50:50 mixture of BSG and CM followed by those supplemented with wet BSG (2.08%) and CM (1.97%). The nutrient intake of the animals was improved as cell wall degradation improved through supplementation. The dietary cell wall (NDF) intake was highly correlated with intake of acid detergent fiber ADF (r=0.997); hemi-cellulose, HC (r=0.912); crude fat, CF (r=0.753), CP (r=0.980); and organic matter, OM (r=0.999). Similarly, digestibility of cell wall positively correlated with ADF (r=0.881), HC (r=0.689), CP (r=0.99) and OM (r=0.99) and moderately correlated with CF digestibility (r=0.40). Except for the moderate relationship with CF digestibility (r=0.457), the sacco cell wall degradability was negatively correlated with in vivo cell wall digestibility. Milk yields on the third week of feeding were 5.25 kg/day, 4.87 kg/day, and 3.14 kg/day for lactating buffaloes supplemented with BSG, BSG + CM, and CM, respectively
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